Step1：sudo apt install pavucontrol
Step2：pavucontrol
Step3：软件界面—configuration—Built—Profile—Analog stereo output ( unplugged)
Step4：软件界面—output Devices—show—All output Devices—Port—Headphones (unplugged )
Step5：用鼠标滑动Headphones (unplugged )下方的橘色音量条就可以听到声音大小的变化
问题：每次开机需要重复一遍All Step
